Question

我！我在c＃wpf应用程序中工作。我正在使用FileHelpers将数据导出到csv文件。我正在使用.net实体框架，所以这个框架已经有了我的sql server数据库的类。对于导出数据，Filehelpers说：

    SqlServerStorage storage = new SqlServerStorage(typeof(OrdersVerticalBar));

       storage.ServerName = "NEON-64";
       storage.DatabaseName = "Northwind";

       // Comment this for Windows Auth
       storage.UserName = "Marcos";
       storage.UserPass = "private :)";
storage.FillRecordCallback = new FillRecordHandler(FillRecordOrder);  

   OrdersVerticalBar[] res = storage.ExtractRecords() as OrdersVerticalBar[];

“OrdersVerticalBar”是我的班级

[DelimitedRecord("|")]
public class OrdersVerticalBar
{
    public int OrderID;
    public string CustomerID;
    public int EmployeeID; 
    public DateTime OrderDate;
    public DateTime RequiredDate;

    [FieldNullValue(typeof(DateTime), "2005-1-1")]
    public DateTime ShippedDate; 
    public int ShipVia; 
    public decimal Freight;
}

这是获取数据的方法：

protected void FillRecordOrder(object rec, object[] fields)
{
    OrdersVerticalBar record = (OrdersVerticalBar) rec;

    record.OrderID = (int) fields[0];
    record.CustomerID = (string) fields[1];
    record.EmployeeID = (int) fields[2];
    record.OrderDate = (DateTime) fields[3];
    record.RequiredDate = (DateTime) fields[4];

    if (fields[5] != DBNull.Value)
         record.ShippedDate = (DateTime) fields[5];
    else
         record.ShippedDate = DateTime.MinValue;

    record.ShipVia = (int) fields[6];
    record.Freight = (decimal) fields[7];
}

它说我要创建这个类，但实体框架已经创建了它。所以，当我尝试获取数据时，我得到“BadUsageException”：

字段：'_ relationships'的类型为：RelationshipManager即不是系统类型，所以这个字段需要CustomConverter（请检查更多信息的文档。）

我尝试转换字段“_relationship”类型的RelationShipManager或忽略它，但不起作用。我该如何解决这个问题？谢谢！

Answer 1

您可以在Engine.Options下手动设置要忽略或删除的字段，请参阅http://www.filehelpers.net/example/Advanced/DynamicChangeOptions/

使用FileHelpers如何忽略RelationshipManager字段？

1 个答案: